Hello Brandobras,
As an alternative, why not use a structure with subfolders?
Instead of, say, MyBooks\HarryPotter1.epub you could get something like:
R\Rowling\HarryPotter1.epub
Or even more levels, eg: R\Ro\Rowling\HarryPotter1.epub
(Yes, I know you cannot have this book on your reader, it's just an example.)
I have a structure like that for my >10,000 books, and find that a lot easier.
And the good thing is, you can let Calibre do most of the work if you specify a template in Preferences > Add/Save > Saving Books (or Send to device).
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